Get your upper back off the top of the bench. This allows the scapula to move with more range of motion, allowing the pecs to get into a more lengthened state.
Keep your palms forward and bring the dumbbells back toward your ears, not down to the side of the body. This also puts the pecs into a deeper stretch.
Use only a slight bend in the elbows. Most people get way too much fixed elbow flexion with flyes, turning into more of a half press/half-flye type of movement.
Increase starting strength with this lift. Bring the bar down controlled and rest it for a half-second without letting the bar sink. Accelerate with as much force and speed as possible.
Never take calf-building advice from guys with naturally huge calves. Instead, seek advice from the guy who had small calves but built them up. Get that advice here.